Toyota Celica Mass Air Flow Sensor

I Bought My Car Used, Its A 2004 Toyota Celica Gts And I Had The Code P0171 On The Dash, So I Started First By Replacing The O2 Sensors....

Operates Normally When Cold But Sputters On Acceleration When The Engine Gets Warmed Up Till 2500 Rpm, Then It Accelerates/operates Normally...

I Wasn't Able To Find Anything About This With A Search, So If There Is Something, I Apologize, And Could Someone Direct Me There. Anyways...